Kondensor berperan penting dalam pengoperasian PLTU Pacitan Unit 2 yang berfungsi untuk mengkondensasikan uap sisa low pressure turbine. Tingkat kevakuman kondensor secara langsung mempengaruhi laju perpindahan panas dari uap ke air pendingin. Overhaul penting untuk dilakukan supaya kinerja kondensor tetap optimal. Penelitian ini meliputi perhitungan LMTD, laju perpindahan panas (Q), koefisien perpindahan panas menyeluruh (U), Perhitungan Number of Transfer Unit (NTU) dan efektivitas kondensor (ɛ). Pada penelitian ini menggunakan 3 beban, yaitu 285, 290 dan 295. Dimana pada beban 285 sebelum overhaul tekanan vakum -0,8969 efektivitas 36,92%, setelah overhaul tekanan vakum -0,9104 didapat efektivitas 55,48%, pada beban 290 sebelum overhaul tekanan vakum -0,8970 didapat efektivitas 40,99%, sedangkan sesudah overhaul tekanan vakum -0,9186 didapat efektivitas 56,72%, serta pada beban 295 kondisi sebelum overhaul memiliki nilai kevakuman -0,8865 dengan efektivitas 45,48% dan setelah overhaul memiliki nilai kevakuman sebesar-0,9069 dengan efektivitas sebesar 59,76%. Laju perpindahan panas pada masing-masing beban pada kondisi sebelum overhaul diperoleh hasil 558.670,58 kJ/s, 597.063,45 kJ/s, dan 608.107,80 kJ/s dan setelah overhaul mengalami penurunan laju aliran 512.407,02 kJ/s, 586.889,85 kJ/s dan 597.700,34 kJ/s. Meskipun laju perpindahan panas (Q) menurun setelah overhaul, efektivitas meningkat, menunjukkan pentingnya kevakuman, kebersihan tube, dan pemeliharaan dalam kinerja kondensor.

The condenser plays a significant role in the operation of Pacitan Unit 2 coal-fired power plant, functioning to condense the remaining steam from the low-pressure turbine. The condenser vacuum level directly influences the heat transfer rate from the steam to the cooling water. Overhaul is crucial to maintain the condenser's optimal performance. This research involves the calculation of LMTD, heat transfer rate (Q), overall heat transfer coefficient (U), Number of Transfer Unit (NTU), and condenser effectiveness (ε). In this study, three loads were used, namely 285, 290, and 295. Where at a load of 285 before the overhaul, the vacuum pressure was -0.8969 with an effectiveness of 36.92%, after the overhaul, the vacuum pressure was -0.9104 resulting in an effectiveness of 55.48%, at a load of 290 before the overhaul, the vacuum pressure was -0.8970 with an effectiveness of 40.99%, while after the overhaul, the vacuum pressure was -0.9186 resulting in an effectiveness of 56.72%, and at a load of 295, the condition before the overhaul had a vacuum value of -0.8865 with an effectiveness of 45.48% and after the overhaul had a vacuum value of -0.9069 with an effectiveness of 59.76%. The heat transfer rate at each load before the overhaul was obtained as 558,670.58 kJ/s, 597,063.45 kJ/s, and 608,107.80 kJ/s, and after the overhaul experienced a decrease in flow rate of 512,407.02 kJ/s, 586,889.85 kJ/s and 597,700.34 kJ/s. Although the heat transfer rate (Q) decreased after the overhaul, the effectiveness increased, indicating the importance of vacuum, tube cleanliness, and maintenance in condenser performance.